html {
    font-size: 62.5%;
}
body{
    padding: 0;
    margin: 0;
}

.nav{
    background-color: #0f6cdb;
    width: 100%;
    height: 50px;
    margin: auto;
}

.nav>ul{
    display: flex;
    padding: 0;
    width: 1200px;
    height: 50px;
    line-height: 50px;
    margin: 0 auto;
    flex-direction: row;
    justify-content: space-around;
}

.nav>ul>li{
    /* padding-left: 10px; */
    padding: 0;
    width: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.one{
    
    font-size: 16px;
    color: #fff;
}

._1row{
    height: 100px;
}
._2row{
    height: 150px;
}
._3row{
   height: 200px;
}
._4row{
    height: 250px;
}

ul[class^="two_"] {
    padding: 0;
    height: 0;
    transition: height 0.8s;
    width: 120px;
    overflow: hidden;
    background-color: whitesmoke;
    opacity: 90%;    
    z-index: 10;
}

ul[class^="two_"] li{
    width: 100%;
    height: 50px;
    
}

ul[class^="two_"] a:hover{
    color: #0f6cdb;
}

ul[class^="two_"] a {
    display: inline-block;
    align-content: center;
    text-align: center;
    font-size: 14px;
    border-bottom: 1px solid black;
    width: 100%;
    height: 49px;
    color: #464646;
}

.nav>ul>li:hover ul[class^="two_"]{
    /* display: block; */
    height: 100%;
    
}
.one:hover{
    color: #ffcf46;
}

a{
    text-decoration-line: none;
}
ul,li{
    list-style-type: none;
}




